IRLZ44N NChannel LogicLevel Power MOSFET
High-Current 55V MOSFET for Switching Applications
The IRLZ44N is a popular Nchannel Power MOSFET designed for highcurrent switching applications. Its logic-level gate drive allows direct control from microcontrollers like Arduino, making it a favorite for DIY and professional projects [citation:1].
LogicLevel Compatible Directly driven by 3.3V or 5V logic circuits [citation:1]
High Current Capability - Handles up to 47A continuous current [citation:1][citation:4]
Maximum Drain-Source Voltage (Vdss) is 55V [citation:1]
Keep gatesource voltage (Vgs) between 20V and +20V for safe operation
Use a gate resistor and pulldown to prevent accidental turnon
Technical Specifications
| Parameter | Value |
|---|
| Drain-Source Voltage (Vdss) | 55V [citation:1] |
| Continuous Drain Current (Id) | 47A [citation:1][citation:4] |
| On-Resistance (RDS(on)) | 0.022Ω [citation:1] |
| Gate Threshold Voltage | 2V [citation:3][citation:4] |
| Input Capacitance (Ciss) | 1700pF [citation:3][citation:4] |
| Package | TO-220 [citation:1] |
| Technology | N-Channel MOSFET [citation:2][citation:4] |
= Key Features =
LogicLevel Gate Drive Turns on fully with 5V or 3.3V logic signals, ideal for microcontrollers [citation:1]
Low OnResistance 22mΩ ensures high efficiency with minimal heat generation [citation:1][citation:3]
Avalanche Rated Builtin robustness against voltage spikes, enhancing reliability [citation:1]
Fast Switching Suitable for highfrequency PWM applications like motor control [citation:1]
= Applications =
- DC-DC converters and power supplies
- DC motor speed control (robotics, drones)
- Solidstate relays and highpower switching [citation:1]
- LED and lighting PWM dimming
- Battery management and load switching [citation:1]
A Powerhouse MOSFET A top choice for highpower, logic-controlled circuits
Versatile and Robust - Excellent balance of current, voltage, and easy driving capabilities [citation:1]
√ Widely available in the TO-220 package for easy breadboard and heatsink mounting [citation:1][citation:4]
√ Directly compatible with 5V Arduino and 3.3V ESP boards [citation:1]
√ Multiple manufacturers offer this part (Infineon, UMW, ISC) [citation:1][citation:4][citation:5]
Connection Guide
Pinout (TO-220 package, face up):
- Pin 1 (Gate): Control signal (logic-level voltage)
- Pin 2 (Drain): Main current path (connect to load)
- Pin 3 (Source): Current return path and common ground
In a typical high-side switch, the load connects between the positive supply and the Drain.
For microcontrollers, a 100Ω to 330Ω gate resistor is recommended to reduce ringing.
The TO-220 metal tab is internally connected to the Drain (pin 2). Ensure proper insulation if mounting to a grounded heatsink.
Troubleshooting
MOSFET not switching on:
- Check Gate voltage is above 2V (ensure at least 4.5V for full conduction)
- Verify Gate is not left floating (use a 10kΩ pull-down resistor)
- Ensure Source and Microcontroller ground are common
Excessive heating:
- Reduce switching frequency
- Ensure Gate voltage is high enough (5V or 10V) to achieve the 22mΩ on-resistance [citation:3]
- Check for insufficient heatsinking
